Los Altos HVAC Company handles the full range of heating and cooling work for homes and businesses across Los Altos and Santa Clara County. That means AC repair and service, furnace repair, heat pump service and installation, full HVAC system replacement, ductwork repair and sealing, thermostat and smart-control upgrades, indoor air quality improvements, seasonal maintenance, and emergency calls when the system goes down. We are open every day from 9:00 AM to 8:00 PM.
Residential HVAC. Commercial HVAC. One number for both.
Call (650) 955-4592 for a quote.
When the heat or the AC quits, the first question is what is actually wrong. A call to us reaches someone who knows the trade and can scope the problem on the phone. The price is confirmed before anything is scheduled, and you are told exactly what the visit covers.
Whether it is an AC that stopped cooling, a furnace that will not fire, a heat pump running in the wrong mode, or a system that has shut down entirely, we diagnose the cause first. You get clear notes on what was found and what was done, so there is no guesswork about what happened or what comes next. Call us and we'll handle the rest.
From aging systems to brand-new installs, the work we do covers every stage of the heating and cooling life cycle. Here is what each type of service involves and what it solves for you.
When a central air system stops cooling or starts blowing warm air, the visit covers a full diagnosis: refrigerant level and leak check, condenser and evaporator coil inspection, and an airflow assessment to find whether the problem is in the equipment or the distribution. An AC tune-up follows the same path, catching small issues before they become a repair call in the middle of a heat stretch.
A furnace not heating, or blowing cold air when it should not, points to a short list of causes. The visit covers heat exchanger condition, ignition and burner inspection, and blower service. Airflow problems, failed ignitors, and control-board faults are all diagnosed on-site, and the repair is confirmed with you before any work proceeds.
A heat pump that is not heating in winter or not cooling in summer often comes down to refrigerant charge, a reversing valve issue, or a control problem. The visit covers a full diagnosis of both modes. When the unit is beyond repair, we handle full replacement and post-install testing to confirm the new system is operating correctly before we leave.
A full system replacement starts with a proper load calculation for the home or building, not a guess at size. We remove the old equipment, install the new system, and test operation across both heating and cooling before the visit ends. Getting the sizing right matters more than the brand on the box, and we walk through the options with you before anything is ordered.
A thermostat that is failing, reading the wrong temperature, or simply too old to communicate with a modern system is worth replacing. We handle the swap from a basic unit to a programmable or smart control, including the low-voltage wiring on the equipment side. Nest, Ecobee, and comparable smart thermostats are all within scope.
Leaking duct runs are one of the most common causes of uneven temperatures and higher-than-expected energy bills. The visit covers a duct inspection to locate where air is escaping, followed by sealing and repair of the affected sections. Fixing duct leaks often improves comfort in rooms that have always been too hot or too cold without touching the equipment itself.
Whole-home filtration, air purifier installation, and UV system options are all part of what we offer on the air quality side. The visit covers an assessment of what the existing system can support, followed by installation of the appropriate upgrade. Particles, allergens, and combustion byproducts each call for a different approach, and we match the solution to what is actually in the air.
A pre-season inspection covers both the heating and cooling sides: cleaning, refrigerant check, filter check, and a review of how the system is performing before the season puts it under load. A system check ends with the readings reviewed with you, so you know what condition the equipment is in and whether anything needs attention before it becomes a repair. We'll get your comfort back on track.
The Bay Area's mild winters have historically meant that many homes here were built without central air conditioning. That is changing. Recent heat events have pushed cooling from a luxury to a necessity, and wildfire seasons have added a new concern about what is coming through the vents. At the same time, California's energy direction is pushing property owners toward heat pump systems that handle both heating and cooling from a single unit. The three services below reflect what is actually coming up most often in this area right now.
Many Los Altos homes were built when the climate made air conditioning feel optional. Installing cooling for the first time starts with a load calculation to size the equipment correctly for the home. If the home has existing ductwork in good condition, a ducted central air system may be the right path. If the ducts are absent, undersized, or in poor shape, a ductless mini-split installation avoids the cost and disruption of adding duct runs entirely. We assess both options and explain the tradeoffs before anything is quoted.
Standard one-inch filters are not rated to capture the fine particulates that wildfire smoke carries into homes. MERV-13 and higher filtration media captures particles at the size that matters for indoor air quality during smoke events. The visit starts with an assessment of whether the existing air handler can support a higher-rated filter without restricting airflow, and then moves to upgrading the filtration media or installing a dedicated whole-home air filtration unit where the system calls for it. For households where air quality during fire season is a concern, this is a practical upgrade, not a luxury one.
California homeowners and property managers are moving away from gas-only heating systems, and a heat pump is the most direct path. A single heat pump unit handles both heating and cooling, replacing a furnace and an air conditioner with one system. The visit covers an evaluation of whether the existing structure and equipment support a heat pump transition, followed by sizing, installation, and full post-install testing. We're one phone call from getting your comfort right.
The hardest part of an HVAC problem is knowing when to call, and the second hardest is not knowing what it will cost until someone is already at the house. We handle that up front. The rate is discussed on the phone, the price is confirmed before anything is scheduled, and you are told what the visit covers before anyone comes out. That applies to repair calls, installation quotes, and replacement estimates alike.
Work is carried out to code on every job, and the scope is settled before the work begins.
One call. One clear diagnosis. One price, agreed first.
We'll confirm the repair with you before it goes ahead.
Before a small issue turns into a full breakdown, a call can often head it off. When the system is already down, no heat or no cooling is an emergency, and we take those calls seriously. Emergency service is available every day from 9:00 AM to 8:00 PM, for both residential and commercial properties.
The scope and the price are settled on the call before anything is dispatched. You know what the visit covers and what it costs before anyone comes out, even on an urgent call.
Noticing uneven temperatures or a spike in energy bills? Commercial HVAC problems tend to compound: a unit that is underperforming in one zone affects the whole building, and a system that is running harder than it should will show up on the utility bill before it shows up as a breakdown. We work with property managers, building owners, and office operators on the same range of services we provide for residential customers: repair, maintenance, installation, and replacement.
Commercial quotes follow the same process as residential ones. The price is confirmed before scheduling, and the system is tested before the visit ends. There are no separate rules for commercial work, just the same straightforward process applied to a larger building.
Los Altos is our primary service area, and we work throughout Santa Clara County. That includes Mountain View, Sunnyvale, Cupertino, Palo Alto, Los Altos Hills, Santa Clara, Campbell, and Saratoga. If you are nearby and not sure whether we cover your address, call and ask.
We serve Los Altos and communities throughout Santa Clara County, including Mountain View, Sunnyvale, Cupertino, Palo Alto, Los Altos Hills, Menlo Park, and Saratoga. Both residential and commercial properties in the area are within our service range.
If you are unsure whether your address is covered, call (650) 955-4592 and we will confirm it on the spot.
Call (650) 955-4592 and describe what the system is doing or what work you need.
We scope the job on the call, explain what the visit covers, and confirm the price before anything is scheduled. That process is the same whether you need a repair, a replacement quote, or a seasonal tune-up.
Yes. We are open every day from 9:00 AM to 8:00 PM, including Saturday and Sunday. Weekend calls are handled the same way as weekday calls: the job is scoped on the phone and the price is confirmed before anything is scheduled.
Check the thermostat settings first to confirm the system is set to the correct mode and temperature. If the thermostat looks right and nothing is running, check that the circuit breaker serving the unit has not tripped.
If neither of those resolves it, call (650) 955-4592 and describe what you are seeing so we can scope the visit and confirm what it covers before coming out.
Warm air blowing from the vents when the AC is running, weak airflow at the registers, a system that cycles on and off without reaching the set temperature, or unusual noises like banging, rattling, or squealing all point to a problem worth addressing before it gets worse. A burning smell or a smell of mildew from the vents is also a reason to call without waiting. Describe the symptom when you call and we can usually narrow down the likely cause on the phone before the visit.
Yes. Many homes in Los Altos were built decades ago with ductwork and equipment that is well past its original design life. We assess what the existing system can support, diagnose what has failed or is failing, and give you a clear picture of whether repair or replacement makes more sense before any work is agreed.
The type of equipment, the age and condition of the system, how accessible the unit is, and whether parts need to be sourced all factor into the final price. If a diagnostic uncovers something beyond the original scope, we explain what was found and confirm the updated price before any additional work proceeds. The rate is always discussed before the visit, not after.
Yes. Property managers, landlords, and commercial building operators can reach us on the same number as residential callers. We keep communication straightforward and provide clear notes on what was found and what was done on every visit, so the person managing the property has a record of the work.
Someone needs to be present to provide access to the equipment, confirm the scope of the work, and approve the price before anything begins. If the primary contact cannot be there, arranging for another adult to be on-site and authorized to make decisions about the job keeps things moving without delay.
Confirm this when you book. The standard process is to settle the scope and the price on the call before the visit is scheduled, so you already know what the visit covers before anyone heads out. If you want a call ahead of arrival, mention it when you book and we will note it.
Clear access to the indoor unit, the furnace or air handler, and the outdoor condenser before the visit. That means moving storage items, furniture, or anything blocking the equipment and the area around it. Good access lets the technician work through the diagnostic and the repair without delays.
Los Altos HVAC Company handles heating, cooling, installation, repair, maintenance, and emergency service for homes and businesses across the area. Whatever the system, whatever the season, we are open every day from 9:00 AM to 8:00 PM.
Clear answers. Real pricing. Real fast response.
Call (650) 955-4592 to get a quote and schedule service.
Whether you are dealing with a system that stopped working this morning or planning a seasonal tune-up before temperatures shift, we cover the full range of residential and commercial heating-and-cooling work across Los Altos and Santa Clara County. The table below lays out what each service covers, who it fits best, and a practical note to help you decide where to start. Call us with any question and we will scope the job on the phone before anything is scheduled.
| Service Type | What It Covers | Common Needs | Things to Know |
|---|---|---|---|
| AC Repair & Service | Compressor and condenser inspection, Refrigerant leak check, Airflow and coil assessment, Diagnosis before any parts are quoted | Homes or businesses where the AC has stopped cooling, short cycles, or blows warm air | A frozen coil is almost always a symptom of something else. We find the root cause before recommending a repair. |
| Ductless Mini-Split Installation | Room-by-room load assessment, Outdoor compressor and indoor unit placement, Refrigerant line routing through small wall penetration, System tested through heating and cooling modes | Older Los Altos homes without existing ductwork, or spaces where adding ducts would require significant renovation | The location of the indoor unit affects coverage and airflow across the room. That placement decision is part of the planning conversation before anything is ordered. |
| Heating & Furnace Repair | Heat exchanger inspection, Ignition system and burner check, Airflow path and filter review, Diagnosis before repair is quoted | Homes with no heat, unusual furnace noises, or a system blowing cold air | A burning smell at the start of heating season can be dust on the heat exchanger. A persistent smell points to something that needs a diagnostic visit. |
| Emergency HVAC Service | No-heat and no-cool calls, Scope confirmed on the call, Price discussed before scheduling, System tested before visit ends | Situations where the system is completely down and comfort or safety cannot wait | We are open daily from 9:00 AM to 8:00 PM for emergency and short-notice calls. The scope and price are settled on the phone before anyone heads out. |
| Heat Pump Electrification | Load assessment and equipment sizing, Ducted and ductless options reviewed, Installation replacing both furnace and AC where both exist, Full system test before visit closes | Los Altos homeowners ready to move on from an aging gas furnace and looking for a system that handles both heating and cooling | The Bay Area's mild winters mean heat pumps operate efficiently here through most of the year. A load calculation confirms the right size before anything is ordered. |
| Seasonal Maintenance & Tune-Ups | Coil cleaning, Refrigerant level check, Electrical connection inspection, Filter assessment and full system test | Homeowners and property managers who want to catch small issues before they become failures mid-season | Scheduling a spring AC tune-up and a fall furnace check before each season starts means shorter wait times and fewer surprises when the system is needed most. |
| Indoor Air Quality & Air Filtration | Assessment of existing filtration setup, Review of what the air handler can support, Filter upgrade or filtration system installation, Airflow check after installation | Households concerned about allergens, particulates, or wildfire smoke affecting indoor air | Higher-rated filters restrict airflow more than standard ones. We confirm the air handler can handle the added resistance before upgrading. |
| Heat Pump Repair & Service | Refrigerant charge check, Reversing valve inspection, Coil and compressor condition, Repair confirmed before work proceeds | Properties where the heat pump has stopped heating or cooling, or short cycles through both modes | Heat pumps handle both heating and cooling from one system, so a fault in one mode often points to a shared component worth checking in both. |
| Ductwork Repair & Sealing | Duct inspection and leak detection, Sealing or repair where needed, Airflow assessment after sealing, Identification of rooms with uneven coverage | Homes with uneven room temperatures, a system that runs constantly, or a spike in energy bills without an obvious equipment cause | Fixing leaking ducts often makes a bigger difference to comfort and energy use than adjusting the equipment itself. |
| Wildfire-Smoke Air Filtration (MERV-13+) | Compatibility check on existing air handler, MERV-13 or higher filter installation, Airflow assessment after upgrade, Review of filter replacement schedule | Santa Clara County households affected by recurring wildfire smoke seasons who want filtration that goes beyond a standard residential filter | Standard one-inch filters are not rated to capture the fine particulates wildfire smoke carries. MERV-13 and higher addresses that gap, but the air handler needs to handle the added resistance without straining the blower. |
| Full System Installation & ReplacementMost Popular | Load calculation for the space, Equipment selection based on actual building needs, Full installation scope breakdown, System tested before visit closes | Homes or commercial spaces where repair costs have climbed or efficiency has dropped enough to show up in energy bills | A load calculation sizes the new system to the building rather than matching the old unit. Oversized equipment short-cycles and undersized equipment runs constantly. |
| Thermostat & Smart-Control Installation | Compatibility check with existing system, Wiring and installation, Calibration of the new control, Full system cycle test before leaving | Homeowners upgrading to a programmable or smart thermostat, or replacing a control that reads temperature incorrectly | Not every smart thermostat is compatible with every system. We check before ordering so the installation goes cleanly. |
Call us at (650) 955-4592 to talk through your system, get a straight answer on pricing, and schedule service that fits your timeline.
(650) 955-4592